The United States Geological Survey has a number of stream gages located throughout Delaware. These estimate stream levels, discharges and record them over time. This data is published on the web and many stations allow users to plot custom graphs. Get updated Delaware river and stream levels from USGS here.

Delaware Stream and River Level Alerts

The United States Geological Survey has a system that will send you an email message when flood levels are reached on any steam with USGS gaging equipment that you have selected. Sign up here to recieve Delaware stream and river level alerts.

Delaware Water Publications

The United States Geological Survey has a number of publications related to water use and water resources in Delaware. View the water resource publications for Delaware here.

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Ammolite is a fossil and a gemstone. It is shell material from fossil ammonites.

The United States Geological Survey publishes updated drought maps on their website. There you can view a map that shows where below normal 7-day average stream flow conditions were recently recorded. The maps are updated daily. Get a current Delaware drought map here.

Delaware Precipitation Map

The National Atlas Project has precipitation maps for Delaware and other states that you can view online or print for personal use. These maps show the average annual precipitation levels mapped across the state. View and print an Delaware precipitation map here. Precipitation maps prepared by the PRISM Climate Group at Oregon State University and the United States Geological Survey.

Delaware Elevation Map

The topography of an area determines the direction of stream flow and often is a primary influence on the geographic distribution of precipitation. View a detailed Delaware elevation map.